Permissions, Privileges, and Access Controls in OpenSSH - CVE-2015-5600

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Main Vulnerability Database Vulnerabilities #VU33288

Permissions, Privileges, and Access Controls in OpenSSH - CVE-2015-5600

Published: August 3, 2015 / Updated: August 3, 2020


Vulnerability identifier: #VU33288
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2015-5600
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.


Affected software

OpenSSH
Amazon Linux AMI
Fedora
Dell Secure Connect Gateway
openssh (Alpine package)
openssh
Integrated Management Module II (IMM2)
3PAR OS

How to mitigate CVE-2015-5600

Install update from vendor's website.

OpenSSH - update to 6.9p1
Dell Secure Connect Gateway - update to 5.14.00.10
openssh (Alpine package) - update to 6.4_p1-r3
Integrated Management Module II (IMM2) - update to 1AOO68L — 5.20
3PAR OS - addressed in versions 3.2.1 MU5, 3.2.2 MU3
openssh - addressed in versions 6.6.1p1-14.fc21, 6.6.1p1-16.fc21, 6.9p1-3.fc22

External References

Related Security Bulletins